"Caleb's death has raised many questions about how and why this could happen to a seemingly healthy boy," the family wrote in a statement on Instagram. "Sadly, tests have confirmed today that Caleb passed away from an undetected medical condition.

"We'll have more definitive answers in the coming weeks but ask that you help us celebrate his life instead of focus on his death.

"Due to an outpouring of support and people's hope to be part of his memorial, we have decided to live-stream the ceremony tomorrow at 8pm EDT."

It comes after Caleb's mum shared a smiling snap of the young star, writing: "Yesterday at 7:08PM Caleb Logan Bratayley passed away of natural causes. This has come as a shock to all of us.